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INFLUENCES OF ADIABATIC BLOCK, NANOFLUID AND MAGNETIC FIELD ON THERMAL ENERGY TRANSPORT IN CAVITY

Nirmalendu Biswas
Department of Mechanical Engineering, Jadavpur University Kolkata, 700032, India

Nirmal Kumar Manna
Department of Mechanical Engineering, Jadavpur University Kolkata, 700032, West Bengal, India

DOI: 10.1615/IHMTC-2017.2170
pages 1567-1574

Abstract

In various applications that involved with heat transfer and fluid flow, the efficient utilization of energy is always a matter of great importance. The present work is devoted to explore a better thermal energy transport using an adiabatic block in a sidewalls-moving differentially heated cavity saturated with Cu-water nanofluids in the presence of external magnetic fields. Both the sidewalls translate at the same speed in opposite directions. The top and bottom walls of the cavity are insulated. The investigation is conducted to analyze the influence of adiabatic block, nanofluid and magnetic field on the heat and fluid flow characteristics. Different modes of convection regime are also investigated exhaustively. Flow physics are governed by the nonlinear and coupled equations that are solved using a developed CFD code. The impact of various pertinent parameters like Reynolds number (Re = 100), Richardson number (Ri = 0.1−100), nanoparticle volume fraction (∅ = 0−0.1) and Hartmann number (Ha = 0−100) are investigated systematically. The results reveal that the heat transport of base liquid is greatly influenced by these parameters. The presence of adiabatic block, depending up on the values of parameters, both favors and hampers overall heat transfer of the system. The novelty of this work is it identifies convection zone for maximum and minimum heat transfer under magneto-hydrodynamic (MHD) flow.

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